The truename of a file is the name that you get by following symbolic links until none remain, then simplifying away `.' and `..' appearing as components. Strictly speaking, a file need not have a unique truename; the number of distinct truenames a file has is equal to the number of hard links to the file. However, truenames are useful because they eliminate symbolic links as a cause of name variation.
file-truename returns the true name of the file
filename. This is the name that you get by following symbolic
links until none remain. The argument must be an absolute file name.
See section Buffer File Name, for related information.
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